A stochastic control approach to Sine Gordon EQFT

Abstract

We study the Sine-Gordon model for ${\beta }^2<4\pi$ in infinite volume. We give a variatonal characterization of it's laplace transform, and deduce from this large deviations. Along the way we obtain estimates which are strong enough to obtain a proof of the Osterwalder-Schrader axioms including exponential decay of correlations as a byproduct. Our method is based on the Boue-Dupuis formula with an emphasis on the stochastic control structure of the problem.

Corrected some error's in the appendices